H2O is an Open Source, Distributed, Fast & Scalable Machine Learning Platform: Deep Learning, Gradient Boosting (GBM) & XGBoost, Random Forest, Generalized Linear Modeling (GLM with Elastic Net), K-Means, PCA, Generalized Additive Models (GAM), RuleFit, Support Vector Machine (SVM), Stacked Ensembles, Automatic Machine Learning (AutoML), etc.
We currently do not have a nice print method for Stacked Ensemble models in R. We can make use of the ensemble@model$model_summary info: https://github.com/h2oai/h2o-3/commit/7906280685279be696ef077af73f535064ae3895